While the UN is currently carrying out its own investigation, a senior military official on 18 May shed some light on the first findings of Kinshasa's probe.

"No military or police officer is involved in the killings of two UN experts in Kasaï last March," said Colonel René Kanyinda, senior military auditor of Kananga, the capital of Kasaï-Central.

During a briefing to the press, Kanyinda confirmed the arrest of two militiamen suspected of involvement in the killings. 16 other militiamen are reportedly still on the run. The judicial file is expected to be transmitted to the military tribunal of Kananga Friday (19 May), which will set a trial date.

"We opened an investigation against the militiamen of Kamuina Nsapu who executed two UN experts in March. We have proceeded to arrest some convicts who will appear for the crimes they have committed. We have completed our investigation and we have to go to the garrison court martial to try the defendants who are at our disposal."

Kanyinda underlined that the investigation into the disappearance of the UN experts' four Congolese colleagues, who have been missing since 12 March when the group was allegedly abducted, is still ongoing.

Earlier this month, IBTimes UK revealed how Congolese organisation APRODEC had urged the UN Security Council to demand the International Criminal Court (ICC) Prosecutor to open an official investigation into crimes committed in central Kasaï region – including the murders – which it claims may be connected to the Congolese security forces.

Kasaï region, in the heart of the DRC, has been plagued by deadly violence between Congolese security forces and the Kamwina Nsapu, since August 2016.